Astronomical Data Archives
- SDSS - imaging and spectroscopy of the northern extragalactic sky
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PanSTARRS - imaging of everything at
- Dark Energy Survey - imaging of 5000 sq. deg. of southern extragalactic sky
- 2MASS - infrared all-sky survey
- Gaia - astrometry and photometry for 1.8 billion stars, all-sky
- TESS - lightcurves of 200,000 stars, all-sky
- OGLE - lightcurves of stars in Galactic bulge and Magellanic Clouds
- LIGO - Gravitational Wave events
- Zwicky Transient Facility - time domain survey, mainly northern hemisphere
- List of current supernovae - from multiple sources
- Transient Name Server - keeps track of all transient alerts
- AAVSO - database of the American Association of Variable Star Observers
- Hubble Legacy Archive - images from the Hubble telescope, nice interface
- MAST - data from UV, optical, and infrared space telescopes; some High-Level Science Products; PanSTARRS
- ESO - data from ESO telescopes, including the VLT
- NOAO - data from NOAO telescopes; older site here
- KOA - some data taken with Keck telescopes
- Gemini
- CFHT
- telarchive - python tool to query a number of these archives at one